Serial device not added correctly

[TVR]

That doesn't look quite right, if you have 3 x matching devices then it lets you remember the first one by device ID. Shouldn't it stop you assigning any of them by device ID?

Thinking about it some more, this might be something we can't guard against. There's nothing to stop a user plugging in one device, remembering it by ID, and then plugging in a duplicate...